Question

The ciliated epithelial cells are mainly present in

• A. Bronchioles and Fallopian tubes
• B. Bile duct and Bronchioles
• C. Fallopian tubes and Pancreatic duct
• D. Eustachian tube and Salivary duct

Answer 1

The correct option is A

Bronchioles and Fallopian tubes

The correct option is A.
Explanation of the correct option:

1. Ciliated epithelial cells are a type of cell that has hair-like extensions called cilia on their surface.
2. Squamous epithelial cells are flat-shaped layers of cells.
3. Squamous epithelial cells have big, polygonal nuclei that are tiny and spherical.
4. It is found in places such as the respiratory and urinary tracts, among others.
5. It can be found on skin surfaces, blood vessel linings, and the esophagus.
6. The respiratory tree is lined by pseudostratified columnar ciliated epithelium from the nasal cavity to the bronchi.
7. Ciliated pseudostratified columnar epithelia is a form of respiratory epithelium present in the trachea and other respiratory tracts that allows for the filtering and humidification of incoming air.
8. The bronchioles are lined by simple columnar to the cuboidal epithelium, but the alveoli have a thin squamous epithelial lining that allows for gas exchange.
9. The epithelium of the Fallopian tube is made up of two types of cells: ciliated and nonciliated secretory cells.

Explanation of the incorrect options:
Option B:

1. Small cholangiocytes line the small ducts, while bigger columnar epithelial cells line the larger ducts, allowing them to satisfy the functional diversity of secretion, excretion, and barrier function.
   

Option C:

1. Cilia are only seen in islet and ductal cells in pancreatic tissues, where they play an important role in tissue organization.
2. Alpha and beta cells comprise the islets of Langerhans of pancreatic cells that create hormones that are released into the bloodstream (e.g., insulin and glucagon).
3. Pancreatic ductal cells line the branching tubes that transport enzymes produced by pancreatic acinar cells into the duodenum.
4. These cells also release bicarbonate, which neutralizes stomach acids.
5. Their absence or disarray causes pancreatic duct anomalies, acinar cell loss, polarity problems, and insulin secretion dysregulation.

Option D:

1. A ciliated columnar epithelium in the tympanic cavity and a pseudostratified, ciliated columnar epithelium with goblet cells near the pharynx make up the epithelial lining of the Eustachian tube.
2. The tube equalizes air pressure inside the eardrum and empties middle ear mucus into the nasopharynx.
3. The salivary ducts are absorptive epithelium.
   

Final answer: The ciliated epithelial cells are mainly present in the bronchioles and fallopian tubes.